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                    2-1 Entry
            
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                    2-2 Output
            
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                    2-3 Module
            
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                    2-4 Resolve
            
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                    2-5 Plugins
            
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                    2-6 DevServer
            
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                    2-7 其它配置项
            
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                    2-8 整体配置结构
            
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                    2-9 多种配置类型
            
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                    2-10 配置总结
            
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                    3-1 使用 ES6 语言
            
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                    3-2 使用 TypeScript 语言
            
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                    3-4 使用 SCSS
            
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                    3-6 使用 React 框架
            
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                    3-10 管理多个单页应用
            
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                    3-11 构建同构应用
            
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                    3-12 构建 Electron 应用
            
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                    3-13 构建 Npm 模块
            
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                    3-16 检查代码
            
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                    3-17 通过 Node.js API 启动 Webpack
            
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                    3-18 使用 Webpack Dev Middleware
            
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                    3-20 加载SVG
            
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                    3-21 加载 Source Map
            
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                    3-22 实战总结
            
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                    4-9 CDN 加速
            
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                    4-10 使用 Tree Shaking
            
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                    4-11 提取公共代码
            
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                    4-12 按需加载
            
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                    4-13 使用 Prepack
            
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                    4-14 开启 Scope Hoisting
            
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                    4-15 输出分析
            
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                    4-16 优化总结
            
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                    5-1 工作原理概括
            
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                    5-2 输出文件分析
            
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                    5-3 编写 Loader
            
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                    5-4 编写 Plugin
            
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                    5-5 调试 Webpack
            
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                    5-6 原理总结
            
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                    常用 Loaders
            
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                    常用 Plugins
            
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DevServer &#x5176;&#x5B9E;&#x662F;&#x57FA;&#x4E8E; <a href="https://github.com/webpack/webpack-dev-middleware" target="_blank">webpack-dev-middleware</a> &#x548C; <a href="https://expressjs.com" target="_blank">Expressjs</a> &#x5B9E;&#x73B0;&#x7684;&#xFF0C;
&#x800C; webpack-dev-middleware &#x5176;&#x5B9E;&#x662F; Expressjs &#x7684;&#x4E00;&#x4E2A;&#x4E2D;&#x95F4;&#x4EF6;&#x3002;</p>
<p>&#x4E5F;&#x5C31;&#x662F;&#x8BF4;&#xFF0C;&#x5B9E;&#x73B0; DevServer &#x57FA;&#x672C;&#x529F;&#x80FD;&#x7684;&#x4EE3;&#x7801;&#x5927;&#x81F4;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre><code class="lang-js"><span class="hljs-keyword">const</span> express = <span class="hljs-built_in">require</span>(<span class="hljs-string">&apos;express&apos;</span>);
<span class="hljs-keyword">const</span> webpack = <span class="hljs-built_in">require</span>(<span class="hljs-string">&apos;webpack&apos;</span>);
<span class="hljs-keyword">const</span> webpackMiddleware = <span class="hljs-built_in">require</span>(<span class="hljs-string">&apos;webpack-dev-middleware&apos;</span>);

<span class="hljs-comment">// &#x4ECE; webpack.config.js &#x6587;&#x4EF6;&#x4E2D;&#x8BFB;&#x53D6; Webpack &#x914D;&#x7F6E; </span>
<span class="hljs-keyword">const</span> config = <span class="hljs-built_in">require</span>(<span class="hljs-string">&apos;./webpack.config.js&apos;</span>);
<span class="hljs-comment">// &#x5B9E;&#x4F8B;&#x5316;&#x4E00;&#x4E2A; Expressjs app</span>
<span class="hljs-keyword">const</span> app = express();

<span class="hljs-comment">// &#x7528;&#x8BFB;&#x53D6;&#x5230;&#x7684; Webpack &#x914D;&#x7F6E;&#x5B9E;&#x4F8B;&#x5316;&#x4E00;&#x4E2A; Compiler</span>
<span class="hljs-keyword">const</span> compiler = webpack(config);
<span class="hljs-comment">// &#x7ED9; app &#x6CE8;&#x518C; webpackMiddleware &#x4E2D;&#x95F4;&#x4EF6;</span>
app.use(webpackMiddleware(compiler));
<span class="hljs-comment">// &#x542F;&#x52A8; HTTP &#x670D;&#x52A1;&#x5668;&#xFF0C;&#x670D;&#x52A1;&#x5668;&#x76D1;&#x542C;&#x5728; 3000 &#x7AEF;&#x53E3; </span>
app.listen(<span class="hljs-number">3000</span>);
</code></pre>
<p>&#x4ECE;&#x4EE5;&#x4E0A;&#x4EE3;&#x7801;&#x53EF;&#x4EE5;&#x770B;&#x51FA;&#xFF0C;&#x4ECE; <code>webpack-dev-middleware</code> &#x4E2D;&#x5BFC;&#x51FA;&#x7684; <code>webpackMiddleware</code> &#x662F;&#x4E00;&#x4E2A;&#x51FD;&#x6570;&#xFF0C;&#x8BE5;&#x51FD;&#x6570;&#x9700;&#x8981;&#x63A5;&#x6536;&#x4E00;&#x4E2A; Compiler &#x5B9E;&#x4F8B;&#x3002;
&#x5728; <a href="3-17&#x901A;&#x8FC7;Node.jsAPI&#x542F;&#x52A8;Webpack.html">3-17 &#x901A;&#x8FC7; Node.js API &#x542F;&#x52A8; Webpack</a> &#x4E2D;&#x66FE;&#x4ECB;&#x7ECD;&#x8FC7; Webpack API &#x5BFC;&#x51FA;&#x7684; <code>webpack</code> &#x51FD;&#x6570;&#x4F1A;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A;Compiler &#x5B9E;&#x4F8B;&#x3002;</p>
<p><code>webpackMiddleware</code> &#x51FD;&#x6570;&#x7684;&#x8FD4;&#x56DE;&#x7ED3;&#x679C;&#x662F;&#x4E00;&#x4E2A; Expressjs &#x7684;&#x4E2D;&#x95F4;&#x4EF6;&#xFF0C;&#x8BE5;&#x4E2D;&#x95F4;&#x4EF6;&#x6709;&#x4EE5;&#x4E0B;&#x529F;&#x80FD;&#xFF1A;</p>
<ul>
<li>&#x63A5;&#x6536;&#x6765;&#x81EA; Webpack Compiler &#x5B9E;&#x4F8B;&#x8F93;&#x51FA;&#x7684;&#x6587;&#x4EF6;&#xFF0C;&#x4F46;&#x4E0D;&#x4F1A;&#x628A;&#x6587;&#x4EF6;&#x8F93;&#x51FA;&#x5230;&#x786C;&#x76D8;&#xFF0C;&#x800C;&#x662F;&#x4FDD;&#x5B58;&#x5728;&#x5185;&#x5B58;&#x4E2D;&#xFF1B;</li>
<li>&#x5F80; Expressjs app &#x4E0A;&#x6CE8;&#x518C;&#x8DEF;&#x7531;&#xFF0C;&#x62E6;&#x622A; HTTP &#x6536;&#x5230;&#x7684;&#x8BF7;&#x6C42;&#xFF0C;&#x6839;&#x636E;&#x8BF7;&#x6C42;&#x8DEF;&#x5F84;&#x54CD;&#x5E94;&#x5BF9;&#x5E94;&#x7684;&#x6587;&#x4EF6;&#x5185;&#x5BB9;&#xFF1B;</li>
</ul>
<p>&#x901A;&#x8FC7; webpack-dev-middleware &#x80FD;&#x591F;&#x5C06; DevServer &#x96C6;&#x6210;&#x5230;&#x4F60;&#x73B0;&#x6709;&#x7684; HTTP &#x670D;&#x52A1;&#x5668;&#x4E2D;&#xFF0C;&#x8BA9;&#x4F60;&#x73B0;&#x6709;&#x7684; HTTP &#x670D;&#x52A1;&#x5668;&#x80FD;&#x8FD4;&#x56DE; Webpack &#x6784;&#x5EFA;&#x51FA;&#x7684;&#x5185;&#x5BB9;&#xFF0C;&#x800C;&#x4E0D;&#x662F;&#x5728;&#x5F00;&#x53D1;&#x65F6;&#x542F;&#x52A8;&#x591A;&#x4E2A; HTTP &#x670D;&#x52A1;&#x5668;&#x3002;
&#x8FD9;&#x7279;&#x522B;&#x9002;&#x7528;&#x4E8E;&#x540E;&#x7AEF;&#x63A5;&#x53E3;&#x670D;&#x52A1;&#x91C7;&#x7528; Node.js &#x7F16;&#x5199;&#x7684;&#x9879;&#x76EE;&#x3002; </p>
<h2 id="webpack-dev-middleware-&#x652F;&#x6301;&#x7684;&#x914D;&#x7F6E;&#x9879;">Webpack Dev Middleware &#x652F;&#x6301;&#x7684;&#x914D;&#x7F6E;&#x9879;</h2>
<p>&#x5728; Node.js &#x4E2D;&#x8C03;&#x7528; webpack-dev-middleware &#x63D0;&#x4F9B;&#x7684; API &#x65F6;&#xFF0C;&#x8FD8;&#x53EF;&#x4EE5;&#x7ED9;&#x5B83;&#x4F20;&#x5165;&#x4E00;&#x4E9B;&#x914D;&#x7F6E;&#x9879;&#xFF0C;&#x65B9;&#x6CD5;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre><code class="lang-js"><span class="hljs-comment">// webpackMiddleware &#x51FD;&#x6570;&#x7684;&#x7B2C;&#x4E8C;&#x4E2A;&#x53C2;&#x6570;&#x4E3A;&#x914D;&#x7F6E;&#x9879;</span>
app.use(webpackMiddleware(compiler, {
    <span class="hljs-comment">// webpack-dev-middleware &#x6240;&#x6709;&#x652F;&#x6301;&#x7684;&#x914D;&#x7F6E;&#x9879;</span>
    <span class="hljs-comment">// &#x53EA;&#x6709; publicPath &#x5C5E;&#x6027;&#x4E3A;&#x5FC5;&#x586B;&#xFF0C;&#x5176;&#x5B83;&#x90FD;&#x662F;&#x9009;&#x586B;&#x9879;</span>

    <span class="hljs-comment">// Webpack &#x8F93;&#x51FA;&#x8D44;&#x6E90;&#x7ED1;&#x5B9A;&#x5728; HTTP &#x670D;&#x52A1;&#x5668;&#x4E0A;&#x7684;&#x6839;&#x76EE;&#x5F55;&#xFF0C;</span>
    <span class="hljs-comment">// &#x548C; Webpack &#x914D;&#x7F6E;&#x4E2D;&#x7684; publicPath &#x542B;&#x4E49;&#x4E00;&#x81F4; </span>
    publicPath: <span class="hljs-string">&apos;/assets/&apos;</span>,

    <span class="hljs-comment">// &#x4E0D;&#x8F93;&#x51FA; info &#x7C7B;&#x578B;&#x7684;&#x65E5;&#x5FD7;&#x5230;&#x63A7;&#x5236;&#x53F0;&#xFF0C;&#x53EA;&#x8F93;&#x51FA; warn &#x548C; error &#x7C7B;&#x578B;&#x7684;&#x65E5;&#x5FD7;</span>
    noInfo: <span class="hljs-literal">false</span>,

    <span class="hljs-comment">// &#x4E0D;&#x8F93;&#x51FA;&#x4EFB;&#x4F55;&#x7C7B;&#x578B;&#x7684;&#x65E5;&#x5FD7;&#x5230;&#x63A7;&#x5236;&#x53F0;</span>
    quiet: <span class="hljs-literal">false</span>,

    <span class="hljs-comment">// &#x5207;&#x6362;&#x5230;&#x61D2;&#x60F0;&#x6A21;&#x5F0F;&#xFF0C;&#x8FD9;&#x610F;&#x5473;&#x7740;&#x4E0D;&#x76D1;&#x542C;&#x6587;&#x4EF6;&#x53D8;&#x5316;&#xFF0C;&#x53EA;&#x4F1A;&#x5728;&#x8BF7;&#x6C42;&#x5230;&#x65F6;&#x518D;&#x53BB;&#x7F16;&#x8BD1;&#x5BF9;&#x5E94;&#x7684;&#x6587;&#x4EF6;&#xFF0C;</span>
    <span class="hljs-comment">// &#x8FD9;&#x9002;&#x5408;&#x9875;&#x9762;&#x975E;&#x5E38;&#x591A;&#x7684;&#x9879;&#x76EE;&#x3002;</span>
    lazy: <span class="hljs-literal">true</span>,

    <span class="hljs-comment">// watchOptions</span>
    <span class="hljs-comment">// &#x53EA;&#x5728;&#x975E;&#x61D2;&#x60F0;&#x6A21;&#x5F0F;&#x4E0B;&#x624D;&#x6709;&#x6548;</span>
    watchOptions: {
        aggregateTimeout: <span class="hljs-number">300</span>,
        poll: <span class="hljs-literal">true</span>
    },

    <span class="hljs-comment">// &#x9ED8;&#x8BA4;&#x7684; URL &#x8DEF;&#x5F84;, &#x9ED8;&#x8BA4;&#x662F; &apos;index.html&apos;.</span>
    index: <span class="hljs-string">&apos;index.html&apos;</span>,

    <span class="hljs-comment">// &#x81EA;&#x5B9A;&#x4E49; HTTP &#x5934;</span>
    headers: {<span class="hljs-string">&apos;X-Custom-Header&apos;</span>: <span class="hljs-string">&apos;yes&apos;</span>},

    <span class="hljs-comment">// &#x7ED9;&#x7279;&#x5B9A;&#x6587;&#x4EF6;&#x540E;&#x7F00;&#x7684;&#x6587;&#x4EF6;&#x6DFB;&#x52A0; HTTP mimeTypes &#xFF0C;&#x4F5C;&#x4E3A;&#x6587;&#x4EF6;&#x7C7B;&#x578B;&#x6620;&#x5C04;&#x8868;</span>
    mimeTypes: {<span class="hljs-string">&apos;text/html&apos;</span>: [<span class="hljs-string">&apos;phtml&apos;</span>]},

    <span class="hljs-comment">// &#x7EDF;&#x8BA1;&#x4FE1;&#x606F;&#x8F93;&#x51FA;&#x6837;&#x5F0F;</span>
    stats: {
        colors: <span class="hljs-literal">true</span>
    },

    <span class="hljs-comment">// &#x81EA;&#x5B9A;&#x4E49;&#x8F93;&#x51FA;&#x65E5;&#x5FD7;&#x7684;&#x5C55;&#x793A;&#x65B9;&#x6CD5;</span>
    reporter: <span class="hljs-literal">null</span>,

    <span class="hljs-comment">// &#x5F00;&#x542F;&#x6216;&#x5173;&#x95ED;&#x670D;&#x52A1;&#x7AEF;&#x6E32;&#x67D3;</span>
    serverSideRender: <span class="hljs-literal">false</span>,
}));
</code></pre>
<h2 id="webpack-dev-middleware-&#x4E0E;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;">Webpack Dev Middleware &#x4E0E;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;</h2>
<p>DevServer &#x63D0;&#x4F9B;&#x4E86;&#x4E00;&#x4E2A;&#x65B9;&#x4FBF;&#x7684;&#x529F;&#x80FD;&#xFF0C;&#x53EF;&#x4EE5;&#x505A;&#x5230;&#x5728;&#x76D1;&#x542C;&#x5230;&#x6587;&#x4EF6;&#x53D1;&#x751F;&#x53D8;&#x5316;&#x65F6;&#x81EA;&#x52A8;&#x66FF;&#x6362;&#x7F51;&#x9875;&#x4E2D;&#x7684;&#x8001;&#x6A21;&#x5757;&#xFF0C;&#x4EE5;&#x505A;&#x5230;&#x5B9E;&#x65F6;&#x9884;&#x89C8;&#x3002;
DevServer &#x867D;&#x7136;&#x662F;&#x57FA;&#x4E8E; webpack-dev-middleware &#x5B9E;&#x73B0;&#x7684;&#xFF0C;&#x4F46; webpack-dev-middleware &#x5E76;&#x6CA1;&#x6709;&#x5B9E;&#x73B0;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;&#x529F;&#x80FD;&#xFF0C;&#x800C;&#x662F; DevServer &#x81EA;&#x5DF1;&#x5B9E;&#x73B0;&#x4E86;&#x8BE5;&#x529F;&#x80FD;&#x3002;</p>
<p>&#x4E3A;&#x4E86;&#x5728;&#x4F7F;&#x7528; webpack-dev-middleware &#x65F6;&#x4E5F;&#x80FD;&#x4F7F;&#x7528;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;&#x529F;&#x80FD;&#x53BB;&#x63D0;&#x5347;&#x5F00;&#x53D1;&#x6548;&#x7387;&#xFF0C;&#x9700;&#x8981;&#x989D;&#x5916;&#x7684;&#x518D;&#x63A5;&#x5165; <a href="https://github.com/glenjamin/webpack-hot-middleware" target="_blank">webpack-hot-middleware</a>&#x3002;
&#x9700;&#x8981;&#x505A;&#x4EE5;&#x4E0B;&#x4FEE;&#x6539;&#x624D;&#x80FD;&#x5B9E;&#x73B0;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;&#x3002;</p>
<p>&#x7B2C;2&#x6B65;&#xFF1A;&#x4FEE;&#x6539; <code>webpack.config.js</code> &#x6587;&#x4EF6;&#xFF0C;&#x52A0;&#x5165; <code>HotModuleReplacementPlugin</code> &#x63D2;&#x4EF6;&#xFF0C;&#x4FEE;&#x6539;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre><code class="lang-js"><span class="hljs-keyword">const</span> HotModuleReplacementPlugin = <span class="hljs-built_in">require</span>(<span class="hljs-string">&apos;webpack/lib/HotModuleReplacementPlugin&apos;</span>);

<span class="hljs-built_in">module</span>.exports = {
  entry: [
    <span class="hljs-comment">// &#x4E3A;&#x4E86;&#x652F;&#x6301;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;&#xFF0C;&#x6CE8;&#x5165;&#x4EE3;&#x7406;&#x5BA2;&#x6237;&#x7AEF;</span>
    <span class="hljs-string">&apos;webpack-hot-middleware/client&apos;</span>,
    <span class="hljs-comment">// JS &#x6267;&#x884C;&#x5165;&#x53E3;&#x6587;&#x4EF6;</span>
    <span class="hljs-string">&apos;./src/main.js&apos;</span>
  ],
  output: {
    <span class="hljs-comment">// &#x628A;&#x6240;&#x6709;&#x4F9D;&#x8D56;&#x7684;&#x6A21;&#x5757;&#x5408;&#x5E76;&#x8F93;&#x51FA;&#x5230;&#x4E00;&#x4E2A; bundle.js &#x6587;&#x4EF6;</span>
    filename: <span class="hljs-string">&apos;bundle.js&apos;</span>,
  },
  plugins: [
    <span class="hljs-comment">// &#x4E3A;&#x4E86;&#x652F;&#x6301;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;&#xFF0C;&#x751F;&#x6210; .hot-update.json &#x6587;&#x4EF6;</span>
    <span class="hljs-keyword">new</span> HotModuleReplacementPlugin(),
  ],
  devtool: <span class="hljs-string">&apos;source-map&apos;</span>,
};
</code></pre>
<p>&#x8BE5;&#x4FEE;&#x6539;&#x5176;&#x5B9E;&#x5C31;&#x662F;&#x76F8;&#x5F53;&#x4E8E;&#x5B8C;&#x6210;&#x4E86;&#x5728; <a href="../4&#x4F18;&#x5316;/4-6&#x5F00;&#x542F;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;.html">4-6 &#x5F00;&#x542F;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;</a> &#x4E2D;&#x63D0;&#x5230;&#x7684; <code>webpack-dev-server --hot</code> &#x7684;&#x5DE5;&#x4F5C;&#x3002;</p>
<p>&#x7B2C;1&#x6B65;&#xFF1A;&#x4FEE;&#x6539; HTTP &#x670D;&#x52A1;&#x5668;&#x4EE3;&#x7801; <code>server.js</code> &#x6587;&#x4EF6;&#xFF0C;&#x63A5;&#x5165; <code>webpack-hot-middleware</code> &#x4E2D;&#x95F4;&#x4EF6;&#xFF0C;&#x4FEE;&#x6539;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre><code class="lang-js"><span class="hljs-keyword">const</span> express = <span class="hljs-built_in">require</span>(<span class="hljs-string">&apos;express&apos;</span>);
<span class="hljs-keyword">const</span> webpack = <span class="hljs-built_in">require</span>(<span class="hljs-string">&apos;webpack&apos;</span>);
<span class="hljs-keyword">const</span> webpackMiddleware = <span class="hljs-built_in">require</span>(<span class="hljs-string">&apos;webpack-dev-middleware&apos;</span>);

<span class="hljs-comment">// &#x4ECE; webpack.config.js &#x6587;&#x4EF6;&#x4E2D;&#x8BFB;&#x53D6; Webpack &#x914D;&#x7F6E;</span>
<span class="hljs-keyword">const</span> config = <span class="hljs-built_in">require</span>(<span class="hljs-string">&apos;./webpack.config.js&apos;</span>);
<span class="hljs-comment">// &#x5B9E;&#x4F8B;&#x5316;&#x4E00;&#x4E2A; Expressjs app</span>
<span class="hljs-keyword">const</span> app = express();

<span class="hljs-comment">// &#x7528;&#x8BFB;&#x53D6;&#x5230;&#x7684; Webpack &#x914D;&#x7F6E;&#x5B9E;&#x4F8B;&#x5316;&#x4E00;&#x4E2A; Compiler</span>
<span class="hljs-keyword">const</span> compiler = webpack(config);
<span class="hljs-comment">// &#x7ED9; app &#x6CE8;&#x518C; webpackMiddleware &#x4E2D;&#x95F4;&#x4EF6;</span>
app.use(webpackMiddleware(compiler));
<span class="hljs-comment">// &#x4E3A;&#x4E86;&#x652F;&#x6301;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;&#xFF0C;&#x54CD;&#x5E94;&#x7528;&#x4E8E;&#x66FF;&#x6362;&#x8001;&#x6A21;&#x5757;&#x7684;&#x8D44;&#x6E90;</span>
app.use(<span class="hljs-built_in">require</span>(<span class="hljs-string">&apos;webpack-hot-middleware&apos;</span>)(compiler));
<span class="hljs-comment">// &#x628A;&#x9879;&#x76EE;&#x6839;&#x76EE;&#x5F55;&#x4F5C;&#x4E3A;&#x9759;&#x6001;&#x8D44;&#x6E90;&#x76EE;&#x5F55;&#xFF0C;&#x7528;&#x4E8E;&#x670D;&#x52A1; HTML &#x6587;&#x4EF6;</span>
app.use(express.static(<span class="hljs-string">&apos;.&apos;</span>));
<span class="hljs-comment">// &#x542F;&#x52A8; HTTP &#x670D;&#x52A1;&#x5668;&#xFF0C;&#x670D;&#x52A1;&#x5668;&#x76D1;&#x542C;&#x5728; 3000 &#x7AEF;&#x53E3;</span>
app.listen(<span class="hljs-number">3000</span>, () =&gt; {
  <span class="hljs-built_in">console</span>.info(<span class="hljs-string">&apos;&#x6210;&#x529F;&#x76D1;&#x542C;&#x5728; 3000&apos;</span>);
});
</code></pre>
<p>&#x7B2C;3&#x6B65;&#xFF1A;&#x4FEE;&#x6539;&#x6267;&#x884C;&#x5165;&#x53E3;&#x6587;&#x4EF6; <code>main.js</code>&#xFF0C;&#x52A0;&#x5165;&#x66FF;&#x6362;&#x903B;&#x8F91;&#xFF0C;&#x5728;&#x6587;&#x4EF6;&#x672B;&#x5C3E;&#x52A0;&#x5165;&#x4EE5;&#x4E0B;&#x4EE3;&#x7801;&#xFF1A;</p>
<pre><code class="lang-js"><span class="hljs-keyword">if</span> (<span class="hljs-built_in">module</span>.hot) {
  <span class="hljs-built_in">module</span>.hot.accept();
}
</code></pre>
<p>&#x7B2C;4&#x6B65;&#xFF1A;&#x5B89;&#x88C5;&#x65B0;&#x5F15;&#x5165;&#x7684;&#x4F9D;&#x8D56;&#xFF1A;</p>
<pre><code class="lang-bash">npm i -D webpack-dev-middleware webpack-hot-middleware express
</code></pre>
<p>&#x5B89;&#x88C5;&#x6210;&#x529F;&#x540E;&#xFF0C;&#x901A;&#x8FC7; <code>node ./server.js</code> &#x5C31;&#x80FD;&#x542F;&#x52A8;&#x4E00;&#x4E2A;&#x7C7B;&#x4F3C;&#x4E8E; DevServer &#x90A3;&#x6837;&#x652F;&#x6301;&#x6A21;&#x5757;&#x70ED;&#x66FF;&#x6362;&#x7684;&#x81EA;&#x5B9A;&#x4E49; HTTP &#x670D;&#x52A1;&#x4E86;&#x3002;</p>
<blockquote>
<p>&#x672C;&#x5B9E;&#x4F8B;<a href="http://webpack.wuhaolin.cn/3-18&#x4F7F;&#x7528;WebpackDevMiddleware.zip" target="_blank">&#x63D0;&#x4F9B;&#x9879;&#x76EE;&#x5B8C;&#x6574;&#x4EE3;&#x7801;</a></p>
</blockquote>

                                
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